Liberally coat a large sauté pan with oil spray, and preheat the pan over medium-high heat. Add the onion and bell pepper and sauté for 5 minutes, or until the vegetables begin to soften. Add additional oil spray or a tablespoon of water if the vegetables start to stick to the bottom of the skillet.

Season the chicken breasts with the salt and pepper. Add the chicken breasts to the pan and cook for 4 minutes on each side.

Add the balsamic vinegar and canned tomatoes, and bring the liquids to a boil. Reduce the heat to medium-low, and simmer uncovered for 25 minutes, stirring occasionally. Season with additional salt and pepper to taste.

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